A - The postman posts the letters through the letterbox. The letter box has a rope attached to it, which runs around a pulley at...

B - the rope is connected to a bell at...

C - The bell rings and wakes....

D - the birds. The bird starts flapping around and this...

E - startles the hamster who jumps onto his wheel...

F - ...and starts running around in it. The wheel powers....

G - ...another rope system which is connected at...

H - by gears to another wheel. That wheel is connected by ropes....

I - ...so that the turning of the wheel causes the tray at....

J - to slowly move upwards until it reaches...

K - the person sitting in bed.

The person in bed can now read their letters without even having to leace their bed.